Biobased water repellent auxiliary and method of manufacturing the same
A biobased water repellent auxiliary agent and a method of manufacturing the same are provided. The biobased water repellent auxiliary agent includes a molecular complex composed of a polyurethane (PU) dendrimer and a water-based polyurethane dispersion (PUD). The PU dendrimer is formed by polymerizing a trifunctional-group-containing biobased material and an aliphatic linear isocyanate. The water-based PUD includes a monomer derived from the trifunctional-group-containing biobased material, a monomer derived from a cyclic isocyanate, and a monomer derived from a hydrophilic compound. The molecular complex is formed by copolymerizing the PU dendrimer, the trifunctional-group-containing biobased material, the cyclic isocyanate, and the hydrophilic compound.
1 . A biobased water repellent auxiliary agent, comprising:
a molecular complex composed of a polyurethane dendrimer and a water-based polyurethane dispersion, wherein
the polyurethane dendrimer is formed by polymerizing a trifunctional-group-containing biobased material and an aliphatic linear isocyanate,
the water-based polyurethane dispersion comprises the trifunctional-group-containing biobased material, a cyclic isocyanate, and a hydrophilic compound, and
the molecular complex is formed by copolymerizing the polyurethane dendrimer with the trifunctional-group-containing biobased material, the cyclic isocyanate and the hydrophilic compound.
2 . The biobased water repellent auxiliary agent of claim 1 , wherein the trifunctional-group-containing biobased material comprises castor oil.
3 . The biobased water repellent auxiliary agent of claim 1 , wherein the aliphatic linear isocyanate is selected from the group consisting of hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), L-lysine diisocyanate (LDI) and a combination thereof.
4 . The biobased water repellent auxiliary agent of claim 1 , wherein the cyclic isocyanate is selected from the group consisting of isophorone diisocyanate (IPDI), 4,4′-diisocyanato dicyclohexylmethane (HMDI) and a combination thereof.
5 . The biobased water repellent auxiliary agent of claim 1 , wherein the hydrophilic compound comprises at least two hydroxyl groups and at least one carboxyl group.
6 . The biobased water repellent auxiliary agent of claim 5 , wherein the hydrophilic compound is selected from the group consisting of glyceric acid, dimethylol propionic acid (DMPA), dimethylol butyric acid (DMBA) and a combination thereof.
7 . The biobased water repellent auxiliary agent of claim 1 , wherein the biobased water repellent auxiliary comprises 5 to 12 wt % of the polyurethane dendrimer, 15 to 30 wt % of the water-based polyurethane dispersion, and the rest is water.
8 . A method of manufacturing a biobased water repellent auxiliary agent, comprising:
a first step of polymerizing a trifunctional-group-containing biobased material with an aliphatic linear isocyanate to form a polyurethane dendrimer; and
a second step of copolymerizing the polyurethane dendrimer with the trifunctional-group-containing biobased material, a cyclic isocyanate and a hydrophilic compound.
9 . The method of claim 8 , wherein in the first step, a weight ratio of the trifunctional-group-containing biobased material to the aliphatic linear isocyanate is 3:1 to 6:1, or 7.05:1.
10 . The method of claim 8 , wherein in the second step, a weight ratio of the trifunctional-group-containing biobased material to the cyclic isocyanate is 1:0.5 to 1:2, or 1:2.16.
11 . The method of claim 8 , wherein in the second step, a weight ratio of the trifunctional-group-containing biobased material to the hydrophilic compound is 1:0.5 to 1:3.
12 . The method of claim 8 , wherein in the second step, a weight ratio of the trifunctional-group-containing biobased material to the polyurethane dendrimer is 1:0.5 to 1:4.
13 . The method of claim 8 , wherein the trifunctional-group-containing biobased material comprises castor oil.
14 . The method of claim 8 , wherein the aliphatic linear isocyanate is selected from the group consisting of hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), L-lysine diisocyanate (LDI) and a combination thereof.
15 . The method of claim 8 , wherein the cyclic isocyanate is selected from the group consisting of isophorone diisocyanate (IPDI), 4,4′-diisocyanato dicyclohexylmethane (HMDI) and a combination thereof.
16 . The method of claim 8 , wherein the hydrophilic compound comprises at least two hydroxyl groups and at least one carboxyl group.
17 . The method of claim 16 , wherein the hydrophilic compound is selected from the group consisting of glyceric acid, dimethylol propionic acid (DMPA), dimethylol butyric acid (DMBA), and a combination thereof.